TW202002352A - Organic light emitting diode display apparatus - Google Patents

Abstract

An organic light emitting diode apparatus includes a substrate and a pixel structure disposed on the substrate. The pixel structure includes an active element, a first electrode electrically connected to the active element, a bank layer disposed on the first electrode, a light emitting layer disposed on the first electrode and an opening of the bank layer, and a second electrode disposed on the light emitting layer. The first electrode has a first region and a plurality of protrusions disposed outside the first region. The opening of the bank layer overlaps with the first region and the plurality of protrusions of the first electrode.

Description

Organic light emitting diode display device

The present invention relates to a display device, and particularly to an organic light-emitting diode display device.

With the advancement of technology, in the process of organic light-emitting diode display devices, an inkjet printing process (Ink Jet Printing; IJP) can be used to form the light-emitting layer. The inkjet printing process is to inject droplets into the opening defined by the bank layer to form a light-emitting layer. However, the thickness of the light-emitting layer formed in the opening of the bank layer is not uniform, which affects the display quality. Specifically, the film thickness of the light-emitting layer around the opening of the bank layer is much greater than the film thickness of the light-emitting layer inside the opening of the bank layer, which causes the area around the opening of the corresponding bank layer and the opening of the corresponding bank layer to display the screen The color difference in the internal area is extremely large, which affects the optical performance of the organic light emitting diode display device.

The invention provides an organic light emitting diode display device with good optical performance.

The organic light emitting diode display device of the present invention includes a substrate and a plurality of pixel structures provided on the substrate. At least one of the plurality of pixel structures includes an active element, a first electrode, a bank layer, a light emitting layer, and a second electrode. The first electrode is electrically connected to the active device, and has a first area and a plurality of protrusions disposed outside the first area. The bank layer is disposed on the first electrode, and has an opening and a sidewall defining the opening. The opening of the bank layer overlaps the first region of the first electrode and the plurality of protrusions. The light emitting layer is disposed on the first electrode and the opening of the bank layer. The light emitting layer includes a first part and a second part, the first part is disposed on the first region of the first electrode, the second part of the light emitting layer is disposed between the plurality of protrusions of the first electrode and the sidewall of the bank layer, and the light emitting layer The film thickness of the second part of is greater than the film thickness of the first part of the light emitting layer. The second electrode is disposed on the light emitting layer.

Based on the above, the first electrode of the organic light emitting diode display device according to an embodiment of the present invention has a plurality of protrusions. A micro gap is formed between the plurality of protrusions of the first electrode and the side wall of the bank layer, and through the capillary action of the micro gap, more droplets used to form the light emitting layer will stay in the micro gap, thereby suppressing light emission The thickness of the layer near the side wall of the bank layer. In this way, the light-emitting layer can have a relatively uniform film thickness, which helps to improve the optical performance of the organic light-emitting diode display device.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected" to another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physical and/or electrical connections. Furthermore, "electrical connection" or "coupling" can mean that there are other components between the two components.

As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within the acceptable deviation range of the specific value determined by those of ordinary skill in the art, taking into account the measurements and A certain amount of measurement-related errors (ie, limitations of the measurement system). For example, "about" may mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. In addition, "about", "approximately" or "substantially" used in this article can select a more acceptable range of deviation or standard deviation according to optical properties, etching properties or other properties, instead of applying one standard deviation to all properties .

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology and the present invention, and will not be interpreted as idealized or excessive Formal meaning unless explicitly defined as such in this article.

Exemplary embodiments are described herein with reference to cross-sectional views that are schematic diagrams of idealized embodiments. Therefore, it is possible to anticipate a change in the shape of the graph as a result of, for example, manufacturing techniques and/or tolerances. Therefore, the embodiments described herein should not be construed as being limited to the specific shape of the area as shown herein, but include deviations in shapes caused by manufacturing, for example. For example, an area shown or described as flat may generally have rough and/or non-linear characteristics. In addition, the acute angle shown may be round. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the precise shapes of the regions, and are not intended to limit the scope of the claims.

Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element symbols are used in the drawings and description to denote the same or similar parts.

FIG. 1 is a schematic top view of an organic light-emitting diode display device according to an embodiment of the invention. FIG. 2 is a schematic cross-sectional view of the organic light emitting diode display device according to the cross-sectional line A-A' of FIG. 1. 3 is a schematic cross-sectional view of an organic light-emitting diode display device according to the cross-sectional line B-B' of FIG. 1. For clarity, FIG. 1 omits the light-emitting layer 126 and the second electrode 125 of FIGS. 2 and 3.

Referring to FIGS. 1, 2 and 3, the organic light emitting diode display device 10 includes a substrate 110 and a plurality of pixel structures 120 disposed on the substrate 110. FIG. 1, FIG. 2 and FIG. 3 depict a pixel structure 120 as an example. Those with ordinary knowledge in the art should be able to implement the organic light-emitting diode display device 10 according to this specification and the drawings, and they will not be drawn one by one here. Multiple pixel structures 120.

In this embodiment, the substrate 110 may be a flexible substrate, a hard substrate, or a combination thereof. For example, the material of the flexible substrate may be Polyimide (PI), polyethylene terephthalate (PET) or other suitable materials, and the material of the hard substrate may be glass, quartz or other Suitable materials, but the invention is not limited thereto.

The pixel structure 120 includes an active element 121 and a first electrode 123 electrically connected to the active element 121. For example, in this embodiment, the active element 121 includes a thin film transistor, and the first electrode 123 is electrically connected to the drain of the thin film transistor. In this embodiment, the pixel structure 120 may optionally include an insulating layer 122 disposed between the first electrode 123 and the substrate 110. The insulating layer 122 covers the active element 121, the first electrode 123 is disposed on the insulating layer 121, the insulating layer 122 has a contact window 122a, and the first electrode 123 can be electrically connected to the active element 121 through the contact window 122a. However, the present invention is not limited to this. According to other embodiments, the first electrode 123 may also be electrically connected to the active element 121 in other suitable ways.

The first electrode 123 has a first region R1 and a plurality of protrusions 123b disposed outside the first region R1. For example, in this embodiment, the first electrode 123 includes a flat portion 123a disposed on the insulating layer 122 and a plurality of protrusions 123b disposed on the flat portion 123a, and the first region R1 of the first electrode 123 may be It is a part of the flat portion 123a. In the present embodiment, the flat portion 123a and the plurality of protrusions 123b can be selectively formed using a half tone mask. That is to say, in this embodiment, the flat portion 123a and the plurality of protrusions 123b can be selectively integrally formed, and the material of the flat portion 123a and the plurality of protrusions 123b can be the same conductive material. However, the present invention is not limited to this. According to other embodiments, a plurality of different photomasks may be used to form the flat portion 123a and the plurality of protrusions 123b, respectively. That is to say, in other embodiments, the flat portion 123a of the first electrode 123 and the plurality of protrusions 123b may not be integrally formed, and the material of the flat portion 123a and the plurality of protrusions 123b may be the same conductive material Or different conductive materials.

In this embodiment, the vertical projection of the plurality of protrusions 123b on the substrate 110 may be a plurality of ellipses. However, the present invention is not limited to this. According to other embodiments, the vertical projection of the protrusion 123b on the substrate 110 may also have other suitable shapes. The following paragraphs will illustrate with other drawings.

The pixel structure 120 further includes a bank layer 124 disposed on the first electrode 123. The bank layer 124 has an opening 124a and a side wall 124b that defines the opening 124a. The opening 124 a of the bank layer 124 overlaps the first region R1 of the first electrode 123 and the plurality of protrusions 123 b of the first electrode 123. In this embodiment, the side wall 124b of the bank layer 124 and the surface 123c of the first electrode 123 have a boundary L (marked in FIG. 1), and the plurality of protrusions 123b of the first electrode 123 are spaced apart from each other and along the boundary L Settings. That is to say, the plurality of protrusions 123b of the first electrode 123 are disposed around the opening 124a, but are not disposed in the middle of the opening 124a. For example, in this embodiment, the material of the bank layer 124 may be photoresist or other suitable materials, but the invention is not limited thereto.

The opening 124a of the bank layer 124 has a first width W1 in the first direction x, the opening 124a of the bank layer 124 has a second width W2 in the second direction y, and the first direction x is staggered with the second direction y. In this embodiment, the first width W1 and the second width W2 may be selectively unequal. In this embodiment, the opening 124a of the bank layer 124 may be an elliptical opening, the short axis of the elliptical opening is located in the first direction x, and the long axis of the elliptical opening is located in the second direction y. However, the present invention is not limited to this, and according to other embodiments, the opening 124a of the bank layer 124 may also have other suitable shapes.

In this embodiment, the sidewall 124b of the bank layer 124 may include a first portion 124b-1 and a second portion 124b-2. The first portion 124b-1 of the sidewall 124b is located in the first direction x, and the second portion 124b of the sidewall 124b -2 is in the second direction y. For example, in this embodiment, the first portion 124b-1 of the side wall 124b and the surface 123c of the first electrode 123 have a first angle α, and the second portion 124b-2 of the side wall 124b and the surface 123c of the first electrode 123 have The second included angle β, and the first included angle α is greater than the second included angle β. That is to say, the first portion 124b-1 of the sidewall 124b of the bank layer 124 is steeper, and the second portion 124b-2 of the sidewall 124b of the bank layer 124 is slower, but the invention is not limited thereto.

The plurality of protrusions 123b are separated from the sidewall 124b of the bank layer 124 by an appropriate distance d1, d2. For example, in this embodiment, the plurality of protrusions 123b includes a plurality of protrusions 123b-1 adjacent to the first portion 124b-1 of the side wall 124b and a plurality of protrusions 123b-1 adjacent to the second portion 124b-2 of the side wall 124b Raised 123b-2. A protrusion 123b-1 is separated from the first portion 124b-1 of the side wall 124b by a first distance d1. One protrusion 123b-2 is separated from the second portion 124b-2 of the side wall 124b by a second distance d2. In this embodiment, the first distance d1 may be substantially equal to the second distance d2. However, the present invention is not limited to this. According to other embodiments, the first distance d1 may not be equal to the second distance d2. The following paragraphs will illustrate with other drawings.

The pixel structure 120 further includes a light emitting layer 126 disposed on the first electrode 123 and the opening 124 a of the bank layer 124. The light emitting layer 126 includes a first portion 126-1 and a second portion 126-2. The first portion 126-1 of the light emitting layer 126 is disposed on the first region R1 of the first electrode 123. That is, the first portion 126-1 of the light emitting layer 126 is provided on the flat portion 123a of the first electrode 123. The second portion 126-2 of the light emitting layer 126 is disposed between the plurality of protrusions 123b of the first electrode 123 and the sidewall 124b of the bank layer 124. In particular, the film thickness T2 of the second portion 126-2 of the light emitting layer 126 is greater than the film thickness T1 of the first portion 126-1 of the light emitting layer 126. That is, the light emitting layer 126 is formed by inkjet printing (inject printing).

The pixel structure 120 further includes a second electrode 125 disposed on the light-emitting layer 126. The light-emitting layer 126 can also be called an organic electroluminescent layer, and the potential difference between the first electrode 123 and the second electrode 125 can drive the organic electroluminescent layer (ie, the light-emitting layer 126) to emit light. For example, in this embodiment, the organic light-emitting diode display device 10 may be of a top emission type, and the first electrode 123 may be a reflective electrode, and the second electrode 125 may be a light-transmitting electrode . However, the present invention is not limited to this. According to another embodiment, the organic light emitting diode display device 10 may also be a bottom emission type, and the first electrode 123 may be a light-transmitting electrode and a second electrode 125 may be a reflective electrode; according to another embodiment, the organic light-emitting diode display device 10 may also be a double-sided light-emitting type, and the first electrode 123 and the second electrode 125 may both be light-transmitting electrodes.

It is worth mentioning that, through the plurality of protrusions 123b of the first electrode 123, the light-emitting layer 126 can have a relatively uniform film thickness, which contributes to the optical performance of the organic light-emitting diode display device 10. In detail, there is a micro gap between the plurality of protrusions 123b of the first electrode 123 and the sidewall 124b of the bank layer 124; when the light-emitting layer 126 is formed by inkjet printing, the protrusion 123b and the bank layer 124 The micro-gap between the side walls 124b can use capillary action to retain a larger amount of droplets (that is, the material forming the light-emitting layer 126) in the micro-gap, thereby suppressing the film of the second part 126-2 of the light-emitting layer 126 Thick T2. As a result, the difference between the film thickness T2 of the second portion 126-2 of the light-emitting layer 126 and the film thickness T1 of the first portion 126-1 of the light-emitting layer 126 is reduced, so that the overall film thickness of the light-emitting layer 126 is more uniform.

4 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. For clarity, FIG. 4 omits the light-emitting layer and the second electrode of the organic light-emitting diode display device 10A.

The organic light-emitting diode display device 10A of FIG. 4 is similar to the organic light-emitting diode display device 10 of FIG. 1, the difference between the two is that: the protrusion 123bA of the organic light-emitting diode display device 10A of FIG. 4 is different from that of FIG. 1 The protrusions 123b of the organic light-emitting diode display device 10 are different. Please refer to FIGS. 1 and 4. Specifically, the vertical projection of the plurality of protrusions 123b on the substrate 110 in FIG. 1 is a plurality of ellipses, and the vertical projection of the plurality of protrusions 123bA on the substrate 110 in FIG. 4 is Multiple circles.

5 is a schematic top view of an organic light-emitting diode display device according to an embodiment of the invention. For clarity, FIG. 5 omits the light-emitting layer and the second electrode of the organic light-emitting diode display device 10B.

The organic light-emitting diode display device 10B of FIG. 5 is similar to the organic light-emitting diode display device 10 of FIG. 1, the difference between the two is that the protrusion 123bB of the organic light-emitting diode display device 10B of FIG. 5 is different from that of FIG. 1. The protrusions 123b of the organic light-emitting diode display device 10 are different. Please refer to FIGS. 1 and 5. Specifically, the vertical projection of the plurality of protrusions 123b on the substrate 110 in FIG. 1 is a plurality of ellipses, and the vertical projection of the plurality of protrusions 123bB on the substrate 110 in FIG. 5 is Multiple rectangles.

6 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. For clarity, FIG. 6 omits the light-emitting layer and the second electrode of the organic light-emitting diode display device 10C.

The organic light-emitting diode display device 10C of FIG. 6 is similar to the organic light-emitting diode display device 10 of FIG. 1, the difference between the two is that the protrusion 123bC of the organic light-emitting diode display device 10C of FIG. 6 is different from that of FIG. 1. The protrusions 123b of the organic light-emitting diode display device 10 are different. Please refer to FIGS. 1 and 6. Specifically, the vertical projection of the plurality of protrusions 123b on the substrate 110 in FIG. 1 is a plurality of ellipses, and the vertical projection of the plurality of protrusions 123bC on the substrate 110 in FIG. 6 is Multiple squares.

7 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. For clarity, FIG. 7 omits the light-emitting layer and the second electrode of the organic light-emitting diode display device 10D.

The organic light-emitting diode display device 10D of FIG. 7 is similar to the organic light-emitting diode display device 10 of FIG. 1, the difference between the two is that the protrusion 123bD of the organic light-emitting diode display device 10D of FIG. 7 is different from that of FIG. 1. The protrusions 123b of the organic light-emitting diode display device 10 are different. Please refer to FIGS. 1 and 7. Specifically, the vertical projection of the plurality of protrusions 123 b on the substrate 110 in FIG. 1 is a plurality of ellipses, and the vertical projection of the plurality of protrusions 123 bD on the substrate 110 in FIG. 7 is Multiple diamonds.

8 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 9 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to section line A-A' of FIG. 8. 10 is a schematic cross-sectional view of an organic light-emitting diode display device drawn according to section line B-B' of FIG. 8. For clarity, FIG. 8 omits the light emitting layer 126 and the second electrode 125 of FIGS. 9 and 10.

The organic light-emitting diode display device 10E of FIGS. 8, 9 and 10 is similar to the organic light-emitting diode display device 10 of FIGS. 1, 2 and 3, the difference between the two is that: the organic light-emitting diode display device The second distance d2 of 10D is smaller than the first distance d1. That is, the distance between the second portion 124b-2 of the side wall 126b of the steep bank layer 124 and the protrusion 123b is longer, while the first portion 124b-1 of the side wall 126b of the slower bank layer 124 and the protrusion The distance between 123b is short. Since the distance d2 between the protrusion 123b and the second portion 124b-2 of the side wall 124b is short, even if the second portion 124b-2 of the side wall 124b is slow, the protrusion 123b and the second portion 124b-2 of the side wall 124b can still be formed The micro-gap with good capillary action further improves the uniformity of the film thickness of the light-emitting layer 126 and enhances the optical performance of the organic light-emitting diode display device 10E.

11 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. FIG. 12 is a schematic cross-sectional view of the organic light emitting diode display device according to the cross-sectional line A-A' of FIG. 11. 13 is a schematic cross-sectional view of an organic light-emitting diode display device drawn according to section line B-B' of FIG. 11. For clarity, FIG. 11 omits the light-emitting layer 126 and the second electrode 125 of FIGS. 12 and 13.

The organic light-emitting diode display device 10F of FIGS. 11, 12 and 13 is similar to the organic light-emitting diode display device 10 of FIGS. 1, 2 and 3, the difference between the two is that: In the embodiment of FIG. 13, one of the protrusions 123b adjacent to the first portion 126b-1 of the side wall 126b has a first height h1, and the plurality of protrusions 123b adjacent to the second portion 126b-2 of the side wall 126b The other has a second height h2, and the second height h2 is greater than the first height h1. That is, the protrusion 123b of the second portion 124b-2 adjacent to the side wall 126b of the gentler bank layer 124 has a higher height h2. In this way, even if the second portion 124b-2 of the side wall 126b is slower, the protrusion 123b having a higher height h2 and the second portion 124b-2 of the side wall 126b can still form a micro gap with a good capillary action, thereby improving The uniformity of the film thickness of the light-emitting layer 126 enhances the optical performance of the organic light-emitting diode display device 10F.

14 is a schematic top view of an organic light-emitting diode display device according to an embodiment of the invention. 15 is a schematic cross-sectional view of an organic light-emitting diode display device according to section line A-A' of FIG. 14. 16 is a schematic cross-sectional view of an organic light-emitting diode display device according to section line B-B' of FIG. 14. For clarity, FIG. 14 omits the light-emitting layer 126 and the second electrode 125 of FIGS. 15 and 16.

The organic light-emitting diode display device 10G of FIGS. 14, 15 and 16 is similar to the organic light-emitting diode display device 10 of FIGS. 1, 2 and 3, the difference between the two is that: In the embodiment of FIG. 16, the second distance d2 of the organic light-emitting diode display device 10F is smaller than the first distance d1; one of the plurality of protrusions 123b adjacent to the first portion 126b-1 of the side wall 126b has a first height h1 The other of the plurality of protrusions 123b adjacent to the second portion 126b-2 of the side wall 126b has a second height h2, and the second height h2 is greater than the first height h1. The organic light-emitting diode display device 10G has the advantages of the aforementioned organic light-emitting diode display device 10E and the organic light-emitting diode display device 10F, which will not be repeated here.

17 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 18 is a schematic cross-sectional view of an organic light-emitting diode display device drawn according to section line A-A' of FIG. 17. For clarity, FIG. 17 omits the light-emitting layer 126 and the second electrode 125 of FIG. 18.

In the embodiments of FIGS. 17 and 18, the organic light emitting diode display device 10H includes a first pixel structure 120-1 and a second pixel for emitting the first color light, the second color light, and the third color light, respectively Structure 120-2 and third pixel structure 120-3. In this embodiment, the first color light, the second color light and the third color light may be blue light, green light and red light respectively, but the invention is not limited thereto.

In particular, the structures of the first pixel structure 120-1, the second pixel structure 120-2, and the third pixel structure 120-3 are not completely the same. Specifically, the plurality of protrusions 123b of the first pixel structure 120-1 are arranged at a first pitch P1, the plurality of protrusions 123b of the second pixel structure 120-1 are arranged at a second pitch P2, and the third picture The plurality of protrusions 123b of the element structure 120-3 are arranged at a third pitch P3. In this embodiment, the first pitch P1 is greater than the second pitch P2, and the second pitch P2 is greater than the third pitch P3. For example, the first pitch P1 may be 2 μm, the second pitch P2 may be 1.5 μm, and the third pitch P3 may be 1 μm, but the invention is not limited thereto.

It is worth mentioning that, in this embodiment, the material of the light-emitting layer 126 of the first pixel structure 120-1, the material of the light-emitting layer 126 of the second pixel structure 120-2 and the third pixel structure 120-3 The materials of the light-emitting layer 126 are different from each other. For example, the droplet concentration of the light-emitting layer 126 used to form the third pixel structure 120-3 is greater than the droplet concentration of the light-emitting layer 126 used to form the second pixel structure 120-2 to form the second picture The droplet concentration of the light emitting layer 126 of the pixel structure 120-2 is greater than the droplet concentration of the light emitting layer 126 used to form the first pixel structure 120-1. Although the density of various droplets used to form the light-emitting layer 126 of the first pixel structure 120-1, the light-emitting layer 126 of the second pixel structure 120-2 and the light-emitting layer 126 of the third pixel structure 120-3 are different, However, through the above arrangement of P1>P2>P3, the film thickness uniformity of the light emitting layer 126 of the first pixel structure 120-1, the film thickness uniformity of the light emitting layer 126 of the second pixel structure 120-2, and the third The uniformity of the film thickness of the light-emitting layer 126 of the pixel structure 120-3 is relatively close, which helps to improve the optical performance of the organic light-emitting diode display device 10H.

17 and 18, in this embodiment, the distance d1-1 between a protrusion 123b of the first pixel structure 120-1 and the sidewall 124b of the bank layer 124 is greater than that of the second pixel structure 120-2 The distance d1-2 between the protrusion 123b and the sidewall 124b of the bank layer 124. The distance d1-2 between a protrusion 123b of the second pixel structure 120-2 and the side wall 124b of the bank layer 124 and the distance d1- between a protrusion 123b of the third pixel structure 120-3 and the side wall 124b of the bank layer 124 3 can optionally be the same. For example, the distance d1-1 may be 1.5 μm, and the distance d1-2 and the distance d1-3 may be 1 μm, but the invention is not limited thereto.

Similarly, since the distance d1-1 is greater than the distance d1-2, even if the droplet concentration of the light-emitting layer 126 used to form the first pixel structure 120-1 is less than the light-emitting layer used to form the second pixel structure 120-2 The droplet concentration of 126, the uniformity of the thickness of the light-emitting layer 126 of the first pixel structure 120-1 is close to the uniformity of the thickness of the light-emitting layer 126 of the second pixel structure 120-2, which helps to improve organic light emission The optical performance of the diode display device 10H.

18, a protrusion 123b of the first pixel structure 120-1 has a first height h1-1, a protrusion 123b of the second pixel structure 120-2 has a second height h1-2, a third picture One protrusion 123b of the element structure 120-3 has a third height h1-3. In this embodiment, the third height h1-3 may be greater than the second height h1-2, and the second height h1-2 may be greater than the first height h1-1, but the invention is not limited thereto.

Similarly, since the third height h1-3 is greater than the second height h1-2, and the second height h1-2 is greater than the first height h1-1, even though it is used to form the light emitting layer 126 of the first pixel structure 120-1 The droplet concentration, the droplet concentration of the light emitting layer 126 used to form the second pixel structure 120-2, and the droplet concentration of the light emitting layer 126 used to form the third pixel structure 120-3 are different from each other. Film thickness uniformity of the light emitting layer 126 of the pixel structure 120-1, film thickness uniformity of the light emitting layer 126 of the second pixel structure 120-2, and film thickness uniformity of the light emitting layer 126 of the third pixel structure 120-3 Closer, helps to improve the optical performance of the organic light emitting diode display device 10H.

19 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. For clarity, FIG. 19 omits the light-emitting layer and the second electrode of the organic light-emitting diode display device 10I.

The organic light-emitting diode display device 10I of FIG. 19 is similar to the organic light-emitting diode display device 10 of FIG. 1, the difference between the two is that the arrangement of the protrusions 123b of the organic light-emitting diode display device 10I is the same as that of the organic light-emitting diode The arrangement of the protrusions 123b of the polar body display device 10 is different. Specifically, the plurality of protrusions 123b of the organic light emitting diode display device 10I includes a first protrusion string S1 and a second protrusion string S2, wherein the first protrusion string S1 is located on the sidewall 124b of the bank layer 124 and the second Between raised strings S2. That is, in the embodiment of FIG. 19, the plurality of protrusions 123b of the organic light-emitting diode display device 10I may be arranged in multiple circles along the boundary edge L.

20 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. For clarity, FIG. 20 omits the light-emitting layer and the second electrode of the organic light-emitting diode display device 10J.

The organic light-emitting diode display device 10I of FIG. 20 is similar to the organic light-emitting diode display device 10 of FIG. 1, the difference between the two is that all the protrusions 123b of the organic light-emitting diode display device 10 are substantially the same, while the organic A part of the plurality of protrusions 123b of the light-emitting diode display device 10I is different from another part of the plurality of protrusions 123b of the organic light-emitting diode display device 10I. Specifically, in the embodiment of FIG. 20, the vertical projection area of a protrusion 123b-1 adjacent to the first portion 124b-1 of the side wall 124b on the substrate 110 can be selectively larger than the first projection adjacent to the side wall 124b The vertical projection area of the other protrusion 123b-2 of the two parts 124b-2 on the substrate 110.

21 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. For clarity, FIG. 21 omits the light-emitting layer and the second electrode of the organic light-emitting diode display device 10K.

The organic light-emitting diode display device 10K of FIG. 21 is similar to the organic light-emitting diode display device 10J of FIG. 20, and the differences between the two are as follows. In the embodiment of FIG. 21, a plurality of protrusions 123b-2 adjacent to the second portion 124b-2 of the side wall 124b are arranged into a third protrusion string S3 and a fourth protrusion string S4, wherein the third protrusion string S3 is located between the second portion 124b-2 of the side wall 124b and the fourth convex string S4. That is, in the embodiment of FIG. 21, the plurality of protrusions 123b-2 of the second portion 124b-2 of the organic light-emitting diode display device 10K near the side wall 124b may be arranged in multiple rows.

22 is a schematic top view of an organic light-emitting diode display device according to an embodiment of the invention. For clarity, FIG. 22 omits the light-emitting layer and the second electrode of the organic light-emitting diode display device 10L.

The organic light-emitting diode display device 10L of FIG. 22 is similar to the organic light-emitting diode display device 10K of FIG. 21, and the difference between the two is as follows. In the embodiment of FIG. 22, the plurality of protrusions 123b-1 adjacent to the first portion 124b-1 of the side wall 124b are arranged into a fifth protrusion string S5 and a sixth protrusion string S6, wherein the fifth protrusion string S5 Located between the sixth convex string S6 and the first portion 124b-1 of the side wall 124b. That is, in the embodiment of FIG. 22, the plurality of protrusions 123b of the first portion 124b-1 of the organic light-emitting diode display device 10L near the sidewall 124b may also be arranged in multiple rows.

In addition, in the embodiment of FIG. 22, the vertical projection area of one protrusion 123b of the third protrusion string S3 on the substrate 110 can be selectively smaller than that of one protrusion 123b of the fourth protrusion string S4 on the substrate 110 In the vertical projection area, the vertical projection area of one projection 123b of the fifth projection string S5 on the substrate 110 may be selectively smaller than the vertical projection area of one projection 123b of the sixth projection string S6 on the substrate 110. That is to say, in the embodiment of FIG. 22, the vertical projection area of the protrusion 123b on the substrate 110 may increase as it moves away from the side wall 124b, but the invention is not limited thereto.

23 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 24 is a schematic cross-sectional view of an organic light-emitting diode display device drawn according to the cross-sectional line A-A' of FIG. 23. For clarity, FIG. 23 omits the light-emitting layer 126 and the second electrode 125 of FIG. 24.

23 and 24. The organic light-emitting diode display device 10M is similar to the organic light-emitting diode display device 10 of FIGS. 1 and 2. The difference between the two is that the insulating layer 122 of the organic light-emitting diode display device 10M has convex The first electrode 123 is disposed on the insulating layer 122, so the first electrode 123 has a plurality of protrusions 123b respectively corresponding to the plurality of protrusions 122b of the insulating layer 122. In this embodiment, the plurality of protrusions 123b of the first electrode 123 overlap the plurality of protrusions 122b of the insulating layer 122, respectively.

In the organic light emitting diode display device 10M, the insulating layer 122 having a plurality of protrusions 122b and the first electrode 123 on the insulating layer 122 can be used to replace the organic light emitting diode display device 10A of any of the foregoing embodiments. The insulating layer 122 and the first electrode 123 of 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I, 10J, 10K, or 10L. Organic light-emitting diode display devices constructed in this alternative manner are also within the scope of the present invention.

In summary, an organic light-emitting diode display device according to an embodiment of the present invention includes a substrate and a plurality of pixel structures disposed on the substrate. At least one of the plurality of pixel structures includes an active element, a first electrode electrically connected to the active element, a bank layer disposed on the first electrode and having an opening, a light emitting layer disposed on the first electrode and the opening of the bank layer And a second electrode provided on the light-emitting layer. In particular, the bank layer has a side wall defining an opening, and the first electrode has a plurality of protrusions near the side wall of the bank layer. The plurality of protrusions of the first electrode form a micro gap with the side wall of the bank layer, and through the capillary action of the micro gap, more droplets used to form the light emitting layer will stay in the micro gap, thereby suppressing The film thickness of a part of the light-emitting layer close to the side wall of the bank layer. In this way, the light-emitting layer can have a relatively uniform film thickness, which helps to improve the optical performance of the organic light-emitting diode display device.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

10, 10A～10M‧‧‧‧ organic light-emitting diode display device 110‧‧‧ substrate 120, 120-1, 120-2, 120-3‧‧‧ pixel structure 121‧‧‧ active element 122‧‧‧ insulation Layer 122a‧‧‧Contact window 122b‧‧‧Protrusion 123‧‧‧First electrode 123a‧‧‧Flat part 123b, 123b-1, 123b-2, 123bA～123bD‧‧‧‧Protrusion 123c‧‧‧ Surface 124 ‧‧‧ Embankment layer 124a‧‧‧Opening 124b‧‧‧Side wall 124b-1‧‧‧First part 124b-2‧‧‧Second part 125‧‧‧Second electrode 126‧‧‧Light emitting layer 126-1‧‧ ‧The first part 126-2‧‧‧The second part A-A', B-B'‧‧‧Cut line d1, d1-1, d1-2, d1-3, d2‧‧‧Distance h1, h1-1 , H1-2, h1-3, h2 ‧‧‧ height L‧‧‧ boundary P1, P2, P3‧‧‧ spacing R1‧‧‧ first zone S1, S2, S3, S4, S5, S6‧‧‧ Convex string T1, T2‧‧‧ film thickness W1, W2‧‧‧ width x, y‧‧‧ direction α, β‧‧‧ included angle

FIG. 1 is a schematic top view of an organic light-emitting diode display device according to an embodiment of the invention. FIG. 2 is a schematic cross-sectional view of the organic light emitting diode display device according to the cross-sectional line A-A' of FIG. 1. 3 is a schematic cross-sectional view of an organic light-emitting diode display device according to the cross-sectional line B-B' of FIG. 1. 4 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 5 is a schematic top view of an organic light-emitting diode display device according to an embodiment of the invention. 6 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 7 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 8 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 9 is a schematic cross-sectional view of an organic light emitting diode display device drawn according to section line A-A' of FIG. 8. 10 is a schematic cross-sectional view of an organic light-emitting diode display device drawn according to section line B-B' of FIG. 8. 11 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. FIG. 12 is a schematic cross-sectional view of the organic light emitting diode display device according to the cross-sectional line A-A' of FIG. 11. 13 is a schematic cross-sectional view of an organic light-emitting diode display device drawn according to section line B-B' of FIG. 11. 14 is a schematic top view of an organic light-emitting diode display device according to an embodiment of the invention. 15 is a schematic cross-sectional view of an organic light-emitting diode display device according to section line A-A' of FIG. 14. 16 is a schematic cross-sectional view of an organic light-emitting diode display device according to section line B-B' of FIG. 14. 17 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 18 is a schematic cross-sectional view of an organic light-emitting diode display device drawn according to section line A-A' of FIG. 17. 19 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 20 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 21 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 22 is a schematic top view of an organic light-emitting diode display device according to an embodiment of the invention. 23 is a schematic top view of an organic light emitting diode display device according to an embodiment of the invention. 24 is a schematic cross-sectional view of an organic light-emitting diode display device drawn according to the cross-sectional line A-A' of FIG. 23.

10‧‧‧ organic light-emitting diode display device

110‧‧‧ substrate

120‧‧‧Pixel structure

121‧‧‧Active components

122‧‧‧Insulation

122a‧‧‧Contact window

123‧‧‧First electrode

123a‧‧‧flat

123b‧‧‧Bump

123c‧‧‧Surface

124‧‧‧Embankment

124a‧‧‧ opening

124b‧‧‧Sidewall

124b-1‧‧‧Part 1

125‧‧‧Second electrode

126‧‧‧luminous layer

126-1‧‧‧Part 1

126-2‧‧‧Part II

A-A’‧‧‧Cut line

d1‧‧‧Distance

R1‧‧‧ District 1

T1, T2‧‧‧film thickness

α‧‧‧ included angle

Claims (15)

An organic light-emitting diode display device includes: a substrate; and a plurality of pixel structures disposed on the substrate, wherein at least one of the pixel structures includes: an active element; a first electrode, and the active The device is electrically connected and has a first area and a plurality of protrusions provided outside the first area; a bank layer is provided on the first electrode and has an opening and a sidewall defining the opening, wherein The opening of the bank layer overlaps with the first region and the protrusions of the first electrode; a light-emitting layer disposed on the first electrode and the opening of the bank layer, wherein the light-emitting layer includes a first portion And a second portion, the first portion is disposed on the first region of the first electrode, the second portion of the light emitting layer is disposed between the protrusions of the first electrode and the sidewall of the bank layer The film thickness of the second portion of the light-emitting layer is greater than the film thickness of the first portion of the light-emitting layer; and a second electrode is disposed on the light-emitting layer. The organic light-emitting diode display device as described in item 1 of the patent application range, wherein the sidewall of the bank layer and a surface of the first electrode have a boundary, and the protrusions are separated from each other and along the Set at the border. The organic light-emitting diode display device as described in item 1 of the patent application range, wherein the protrusions include a first protrusion string and a second protrusion string, and the first protrusion string is located on the bank layer Between the side wall and the second convex string. The organic light-emitting diode display device as described in item 1 of the patent application range, wherein the sidewall of the bank layer includes a first portion and a second portion, the first portion of the sidewall and a surface of the first electrode have A first included angle, the second portion of the side wall and the surface of the first electrode have a second included angle, the first included angle is greater than the second included angle; the first portion of the side wall and the adjacent to the side wall One of the protrusions of the first part is separated by a first distance, the second part of the side wall is separated from the other of the protrusions of the second part adjacent to the side wall by a second distance, and the first The second distance is smaller than the first distance. The organic light-emitting diode display device as described in item 1 of the patent application range, wherein the sidewall of the bank layer includes a first portion and a second portion, the first portion of the sidewall and a surface of the first electrode have A first included angle, the second portion of the side wall and the surface of the first electrode have a second included angle, the first included angle is greater than the second included angle; the protrusions adjacent to the first portion of the side wall One has a first height, and the other of the protrusions adjacent to the second portion of the side wall has a second height, and the second height is greater than the first height. The organic light-emitting diode display device as described in item 1 of the patent application scope, wherein the at least one of the pixel structures includes a first pixel structure for emitting a first color light and a first pixel structure for emitting a first color light A second pixel structure of dichromatic light, a plurality of protrusions of the first pixel structure are arranged at a first pitch, a plurality of protrusions of the second pixel structure are arranged at a second pitch, and the first The pitch is greater than this second pitch. The organic light emitting diode display device as described in item 6 of the patent application range, wherein the at least one of the pixel structures further includes a third pixel structure for emitting a third color light, the third pixel The protrusions of the structure are arranged at a third pitch, and the second pitch is greater than the third pitch. The organic light-emitting diode display device as described in item 1 of the patent application scope, wherein the at least one of the pixel structures includes a first pixel structure for emitting a first color light and a first pixel structure for emitting a first color light A second pixel structure of dichromatic light, a distance between one of the plurality of protrusions of the first pixel structure and the side wall of the bank layer is greater than one of the plurality of protrusions of the second pixel structure and the bank A distance of the side wall of the layer. The organic light-emitting diode display device as described in item 1 of the patent application scope, wherein the at least one of the pixel structures includes a first pixel structure for emitting a first color light and a first pixel structure for emitting a first color light A second pixel structure of dichromatic light, one of the protrusions of the first pixel structure has a first height, and one of the protrusions of the second pixel structure has a second height, and the The second height is greater than the first height. The organic light-emitting diode display device as described in item 1 of the patent application range, wherein the sidewall of the bank layer includes a first portion and a second portion, the first portion of the sidewall and a surface of the first electrode have A first included angle, the second portion of the side wall and the surface of the first electrode have a second included angle, the first included angle is greater than the second included angle; the protrusions adjacent to the first portion of the side wall One of the vertical projection areas on the substrate is larger than the vertical projection area of the other projections adjacent to the second portion of the side wall on the substrate. The organic light-emitting diode display device as described in item 1 of the patent application range, wherein the sidewall of the bank layer includes a first portion and a second portion, the first portion of the sidewall and a surface of the first electrode have A first included angle, the second portion of the side wall and the surface of the first electrode have a second included angle, the first included angle is greater than the second included angle; the protrusions adjacent to the second portion of the side wall The raised protrusions are arranged into a third protrusion string and a fourth protrusion string, and the third protrusion string is located between the fourth protrusion string and the second portion of the side wall. The organic light emitting diode display device as described in item 11 of the patent application range, wherein a projection of the third projection string on the substrate is smaller than a projection of the fourth projection string on the substrate The vertical projection area on the substrate. The organic light-emitting diode display device as recited in item 11 of the patent application range, wherein the plurality of protrusions adjacent to the first portion of the side wall are arranged in a fifth protrusion string and a sixth A raised string, and the fifth raised string is located between the sixth raised string and the first portion of the side wall. The organic light-emitting diode display device as described in item 13 of the patent application range, wherein a projection of the fifth projection string on the substrate is smaller than a projection of the sixth projection string on the substrate The vertical projection area on the substrate. The organic light-emitting diode display device as described in item 1 of the patent application range, wherein the at least one of the pixel structures further comprises: an insulating layer provided on the substrate and having a plurality of protrusions, wherein the insulating The layer is located between the first electrode and the substrate, and the protrusions of the first electrode respectively correspond to the protrusions of the insulating layer.

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